jinja2

问题 I originally implemented Jinja2 on App Engine using the examples shown on the App Engine site here: https://developers.google.com/appengine/docs/python/gettingstartedpython27/templates where jinja2 is imported directly: import jinja2 import os jinja_environment = jinja2.Environment( loader=jinja2.FileSystemLoader(os.path.dirname(__file__))) class MainPage(webapp2.RequestHandler): def get(self): greetings = 'somestring' template_values = { 'greetings': greetings, } template = jinja_environment

问题 jinja2 has filter '|default()' to works with undefined variables. But it does not work with dictionary values. if D may have or not have key foo (D[foo]), than: {{ D[foo]|default ('no foo') }} will prints 'no foo' if D is undefined, but will cause error ('dict object' has no attribute 'foo') if D is defined, but D[foo] is undefined. Is any way to make default for dictionary item? 回答1: This appears to be working properly for me using Ansible 1.7.2. Here's a test playbook I just wrote: --- -

问题 I am new to React and experimenting a bit. I would like to use it on my Flask site that uses Jinja2 templates. People seem to recommend to render data on the server-side first instead of having to always make an initial call for data on page load. I found this nodejs example but it just puts the data on the page in a global variable in an inline script tag. I was wondering if there was a clean way to do this other than just putting the data on the page inside an inline script tag. Because of

问题 {% set cnt = 0 %} {% for room in rooms %} {% for bed in room %} {% set cnt = cnt + 1 %} {% endfor %} {{ cnt }} {% endfor %} Say we have that nested loop, printed cnt will ALWAYS be 0, because that's what it was defined when we entered the 1st for loop. When we increment the counter in the inner loop, it seems to only be a local variable for the inner loop -- so it will increment while inside the loop, but then that local cnt is gone. HOW can we modify the global cnt??? As great as the Jinja2

问题 {% set cnt = 0 %} {% for room in rooms %} {% for bed in room %} {% set cnt = cnt + 1 %} {% endfor %} {{ cnt }} {% endfor %} Say we have that nested loop, printed cnt will ALWAYS be 0, because that's what it was defined when we entered the 1st for loop. When we increment the counter in the inner loop, it seems to only be a local variable for the inner loop -- so it will increment while inside the loop, but then that local cnt is gone. HOW can we modify the global cnt??? As great as the Jinja2

问题 I have a problem while using jinja2 url_for() function. I have a route like this: @app.route('/article/<int:article_id>/<url_title>/', methods=['GET']) def article_page(article_id, url_title): article = Article.query.get(article_id) if article == None: abort(404) return render_template('article.html', article=article) in jinja template file,i want to create a url which links to article_page,so i write like this: <h5> <a href="{{ url_for('article_page',article_id=article.id,url_title=article

问题 I have a problem while using jinja2 url_for() function. I have a route like this: @app.route('/article/<int:article_id>/<url_title>/', methods=['GET']) def article_page(article_id, url_title): article = Article.query.get(article_id) if article == None: abort(404) return render_template('article.html', article=article) in jinja template file,i want to create a url which links to article_page,so i write like this: <h5> <a href="{{ url_for('article_page',article_id=article.id,url_title=article

问题 I am trying to convert to upper case a string in a Jinja template I am working on. In the template documentation, I read: upper(s) Convert a value to uppercase. So I wrote this code: {% if student.department == "Academy" %} Academy {% elif upper(student.department) != "MATHS DEPARTMENT" %} Maths department {% endif %} But I am getting this error: UndefinedError: 'upper' is undefined So, how do you convert a string to uppercase in Jinja2? 回答1: Filters are used with the |filter syntax: {% elif

问题 I am using google app engine in python with a Jinja2 template engine. This may be a silly solution but I have a list of a few thousand users and right now they can only access their own profile pages and have to be logged in to do it. I would like to give every user a unique URL for their profile page and I am wondering how to do it. I am not sure if this would work but could something like this be feasible? class ProfilePage userlist = GQL query to return all users in the system user = users

问题 I am trying Jinja2 for my Django website. Now, since Jinja2 is not official Django templating engine and its refusing to recognise / load the template tags I was using prior to Jjinja2. Now, even if there has to be a change in the template tags creation, then how is it possible to reflect across the 3rd party apps? In that case it seems impossible to use Jinja2 since the system has to work as per Jinja2. (I am also using coffin as an adapter for Jinja-Django). 回答1: According to coffin docs